CN100546296C - Be used for method at the wireless network transmission signals - Google Patents
Be used for method at the wireless network transmission signals Download PDFInfo
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- CN100546296C CN100546296C CNB2006100935300A CN200610093530A CN100546296C CN 100546296 C CN100546296 C CN 100546296C CN B2006100935300 A CNB2006100935300 A CN B2006100935300A CN 200610093530 A CN200610093530 A CN 200610093530A CN 100546296 C CN100546296 C CN 100546296C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/14—Channel dividing arrangements, i.e. in which a single bit stream is divided between several baseband channels and reassembled at the receiver
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Abstract
Be the transmission of the signal cheaply in the wireless network of guaranteeing particularly to have highdensity WAP (wireless access point), a kind of method has been proposed, wherein by the cable transmission signal between base station and WAP (wireless access point), the method comprising the steps of: the useful band (20) of determining every cable; At least two cables of association (21); With filtering signals is subband (22); Each subband of one or more cable transmission (25) by related cable; At receiving terminal reconstruction signal (27) from subband.The wireless headend and the wireless controller of the inventive method have also been proposed all to be suitable for.
Description
The cross reference of related application
The present invention is based on European priority requisition EP 05291456.1, introduce its content by reference at this.
Technical field
The present invention relates to a kind of method that is used at the wireless network transmission signals, wherein by the cable transmission signal between wireless headend (radio head) and wireless controller.The invention still further relates to wireless headend and wireless controller.
Background technology
Move in the environment of development of infrastructure in the broadband, particularly in 4G (the 4th generation) network and the wireless enterprise network of high data rate, picocell (pico cell) is installed is become more and more important.Picocell provides bit rate and has the part of cellular network of the typical radius of 50-100m.Every sq-km can be installed a nearly hundreds of WAP (wireless access point).This causes first concentrated layer (concentration layer) at network node place, and promptly ground floor or physical layer need a large amount of links.
On the one hand, as in 2G (second generation) or 3G (third generation) network, be expensive to the use of leased line, if the bit rate of especially every access point is higher.On the other hand, compare with the 2G/3G network, every user's income will be almost constant in the 4G network.Therefore, the income part that is exclusively used in transmission should not increase significantly.
The transmission solution that high data rate suitably is provided is ATM (asynchronous transfer mode), SDH (synchronous digital hierarchy), Ethernet etc.But current, in the design of wireless access network, transmission is not optimized usually.Usually, transmission equipment is installed certain protocol.Under the situation of picocell, the feasible transmission that must in WAP (wireless access point), install based on agreement of this method.This WAP (wireless access point) is very complicated, has physical layer and MAC (media interviews control) layer and management level and host-host protocol.For example, realized this WAP (wireless access point) in WiFi (Wireless Fidelity) solution, wherein " gently " and " weight " WAP (wireless access point) exists according to management capabilities.Transmission solution under this particular case is an Ethernet.
Said method is very complicated, and therefore very expensive.Therefore, an object of the present invention is to provide transmission method with the complexity that reduces.
Summary of the invention
This purpose realizes in the method for wireless network transmission signals between wireless headend and wireless controller that by a kind of being used for wherein by the cable transmission signal, described method comprises step:
-determine the useful band of every cable;
At least two cables of-association;
-be subband with filtering signals;
-by each subband of one or more cable transmission in the related cable;
-at receiving terminal reconstruction signal from subband.
The invention enables nearly all complexity to be concentrated on the wireless controller end of connection, thereby avoided the bigger and expensive expense of high level of the agreement of wireless headend end.Major advantage is for the transmission between wireless headend and wireless controller, not need signal is carried out demodulation.Any demodulation or modulation are all only carried out by the central point of the wireless network such as wireless controller rather than by wireless headend.The inventive method is reduced to the transmission of the signal between wireless headend and the wireless controller transparent transmission of the advanced processes of undesired signal.
In addition, the present invention has utilized cable.Cable is almost ubiquitous, cheap, reliable, easy to be adapted to, and uses according to its actual bandwidth that provides.Especially, can adopt the wiring that has existed.By only handling signal waiting for transmission and recover this signal subsequently, can make that transmission is transparent concerning the air interface of wireless network by selecting the appropriate signals type at transmission.With filtering signals is subband so that transmit feasible can the transmission even complicated signal with the running cost of minimum by cable.
Can notice, determine the useful band of every cable can be for example carrying out with the mode of static state when being used for the standard cable of routine call for network installation, perhaps can also dynamically carry out for example per termly a few minutes.Especially, when adopting the cable of big bandwidth for high data rate communication, for example for ADSL (ADSL (Asymmetric Digital Subscriber Line)), define the frequency band of usefulness and finally also cable is associated as the group that comprises at least two cables when preferably dynamically for example sending signal or clear and definite sets of signals at every turn or setting up new communication.How many cables are carried out association or grouping depends on required capacity, for example the number of subband and width.
Be filtered into subband and in frequency domain, carry out, and the conversion scheme of Fourier's type is preferred especially.With signal segmentation is that subband and antithetical phrase band are handled and transmitted and make because whole transmission process, particularly the risk minimization of the signal degradation of any kind that causes owing to linear damage.
In a preferred embodiment, the method comprising the steps of:
The direct frequency spectrum and related cepstra of each subband of-establishment;
-by the direct frequency spectrum of some cable transmission in the related cable and by its related cepstra of other cable transmission in the related cable;
-reconfigure the related cepstra of each direct frequency spectrum at receiving terminal with it.
This is advantageous particularly under the situation of for example outdoor, second-rate wiring and so on, and reason is that this makes can simplified equalization under the situation of the difficult channel with nonlinear noise for example or impulse noise.
In other preferred embodiments, only create direct frequency spectrum.This is a preferably more uncomplicated process when adopting expection noise or other to disturb still less house wiring for example.
Preferably, calibration and balanced digitally carry out under the situation of more weak distortion and decay is perhaps being carried out under digital tool and simulation tool auxiliary under the situation of serious distortion and decay.Show, advantageously after reconfiguring, carry out equilibrium, to alleviate the low pass decay or the dispersion attenuation that may cause by transmission by cable.In addition, show, advantageously after reconstruct, calibrate and/or meticulous equilibrium (fine equalize).Calibration has reduced the information dropout that causes owing to noise, and meticulous equilibrium has reduced the information dropout that causes owing to the decay between transmission period.Preferably carry out meticulous equilibrium by subband ground (sub-band bysub-band).
Under the situation that will transmit multiplexed signals, should preferably further carry out demultiplexing to multiplexed signals before processing and the transmission.
The present invention can advantageously be transmitted the optional frequency multiplexed signals.In a preferred embodiment of the invention, OFDM (OFDM) signal is transmitted.Expection OFDM is the modulation of using as standard in the 4G network.
Preferably, by the copper cable transmission signals.Copper cable is cheap especially, because large-scale copper cable network exists.Copper cable is very suitable for the transmission of signal, and according to distance and cable condition, can provide the bandwidth of about 1 megahertz to several megahertzes.For example, adopt indoor CAT5 (the 5th class) cable to allow typically the nearly scope of 200m.Under the situation of outdoor picocell, even can realize nearly 1000m.
The method according to this invention is particularly suitable at cellular network, particularly has transmission signals in the cellular network of picocell.
In another aspect, the present invention relates to a kind of wireless controller, be used for going to by cable transmission and from the signal of wireless headend, this wireless controller comprises at wireless network:
-be used for determining the device of the useful band of every cable;
-be used for the device of related at least two cables;
-to be used for filtering signals be the device of subband; And
-be used for from the device of subband reconstruction signal.
In the end in aspect, the present invention relates to a kind of wireless headend, be used for going to by cable transmission and from the signal of wireless controller, described wireless headend comprises at wireless network:
-to the interface arrangement of antenna;
-to be used for filtering signals be the device of subband; And
-be used for from the device of subband reconstruction signal.
Wireless headend only provides the infrastructure that is used for actual transmission signal, corresponds essentially to the PHY layer (physical layer) of agreement.Only need be used to realize high-rise other device at the wireless controller end.Compare with normally used WAP (wireless access point), this has simplified the design and the equipment of wireless headend significantly, and this is feasible according to the cost minimization of passing through the wireless network of cable transmission signal of the present invention.It is necessary by any complicated wireless signal of cable transmission having only said apparatus, and does not need a lot of running costs.
In the preferred implementation of wireless headend or wireless controller, they also comprise the inversion set of signal shaping and/or demultiplexing/multiplexer and/or mould-number/number-digital-to-analog conversion apparatus and/or reverse/again.
Description of drawings
Detailed description of the present invention is provided below.Described description provides by non-limiting example with reference to the accompanying drawings, wherein:
The schematically illustrated basic conception of the present invention of considering affected layer of Fig. 1;
Fig. 2 is the overview flow chart of first embodiment of the method according to this invention;
Fig. 3 is the overview flow chart of second preferred embodiment;
Fig. 4 exemplarily illustrates the processing that signal carried out to being used to transmit according to second embodiment of the invention;
The schematically illustrated embodiment of Fig. 5 according to wireless controller of the present invention; And
The schematically illustrated embodiment of Fig. 6 according to wireless headend of the present invention.
Embodiment
Below will the present invention will be described in more detail at having the cellular network that picocell covers.This 4G network uses ofdm signal to transmit.Other favourable application are indoor nets of high data rate enterprise for example, wherein can utilize for example existing Ethernet wiring of CAT5 cable and so on.Another example can be in cellular network replaces coaxial cable with twisted cable (twisted cable) between the processing entities in the bottom of the antenna on the building roof and building.The present invention is particularly useful concerning 20MHz arrives the target spectrum of 100MHz.
Schematically illustrated affected layer the basic conception of considering as the base station controller 16 of wireless controller of the present invention of Fig. 1.Base station controller 16 is connected to base transceiver station 10,12 by copper cable to 14, so that at low cost signal is transferred to base transceiver station 10,12 as wireless headend with very high bit rate.
As shown in Figure 1, all high layer function all concentrate in the individual equipment, are base station controller 16 at this.Especially, only carry out as the advanced processes of modulation and demodulation and so on by base station controller 16 rather than by base transceiver station 10,12.To have only radio function (be in this example transparent with simulation) be long-range and be arranged in base transceiver station 10,12, thereby reduced the complexity and the cost of base transceiver station significantly.
Usually, use the layer that comes from the lower function that is embodied as hardware to the level (hierarchy) that relates to practical application and be embodied as the more abstract function of software usually the function of describing base station controller 16 or network node to classify.General signal transmission and route and multiplexing and demultiplexing are realized by the circuit on the hardware-level.Physical layer PHY is responsible for modulation and balanced.How easily MAC layer MAC and multiple-input and multiple-output layer MIMO are responsible for the transmission on the abstraction level more, because their management address, whither send signal (MAC) and reorganization and processing signals (MIMO).Dispatch layer is responsible for encapsulating, and if pay need be to the storage of practical application, and for example for real-time service, then cache layer provides the storage to practical application.The mobility layer is fully relevant with practical application with the gateway layer.
Opposite with the conventional method that is used for transmission signals, wherein in these conventional methods, by adding host-host protocol and management level, emphasis is on the upper strata, be the MAC layer and more high-rise on, the present invention has utilized by lowermost layer, the possibility that particularly transmission, route and multiplexing reconciliation multiplex layer provide.In some embodiments of the invention, also implied the PHY layer.This make can effectively utilize cable with high data rate between network node, i.e. transmission signals at low cost between base station controller 16 and base transceiver station 10,12 in this example, and under the situation of considering essential layer, reduce the complexity of each node as much as possible.
Can notice, in the network of reality, more than two base transceiver stations 10,12 are connected to base station controller, but nearly a hundreds of base transceiver station is connected to base station controller, have improved the potentiality that the method according to this invention reduces transmission cost widely.
Fig. 2 is the overview flow chart of first embodiment of the method according to this invention.It will utilize the CAT5 cable distribution (cabling) that is used for Ethernet that has existed and use in indoor enterprise picocell network.
In first step 20, cable (preferably copper cable) is surveyed with definite useful band that they can provide.If this carries out statically, the minimum frequency band that then other processing can provide based on them.If this dynamically carries out, then utilize actual band.Result according to frequency band is determined is associated as group (step 21) with cable.Preferably, carrying out related to the cable that bandwidth much at one is provided is the available band that the narrow-band of related cable determines this association cable to utilize the available resources reason best.
With filtering signals is subband (step 22), and reason is that unit waiting for transmission is more little, and the probability of drop-out is just low more owing to transmit.This makes and can transmit even very complicated signal or carry the signal of the information of several bits, and does not need very high expense.Being as the criterion is ready for use on the subband of transmission, for example by adopting discrete Fourier transform (DFT) to create direct frequency spectrum (step 24).The direct frequency spectrum that can create signal equally is a subband with the spectrum division of signal subsequently also, so that transmission signals.By the direct frequency spectrum of related cable transmission (step 25), and reconstruction signal (step 27) and carry out equilibrium from the signal subband subsequently.
Fig. 3 is at outdoor picocell or has the picocell of wiring of poor quality and the flow chart of the second preferred embodiment of the method according to the invention optimized.This embodiment is also shown in Figure 4.Because relatively poor transmission conditions, the antithetical phrase band duplicates, and creates cepstra (step 24).
By related cable the subband of the direct frequency spectrum of signal and corresponding cepstra is transmitted wherein the direct frequency spectrum of some cable transmission by related cable, and pass through the corresponding cepstras of other cable transmission (step 25).At acceptance point, base transceiver station place for example, from subband, signal is reconstructed and balanced (step 27) before, with direct frequency spectrum and its corresponding cepstra addition, thereby and recover each subband (step 26).Can notice that the subband that signal is provided has been owing to equilibrium has been simplified in the influence that has reduced linear damage, and provide cepstra owing to equilibrium has been simplified in the influence that has reduced nonlinear impairments.
Fig. 4 exemplarily illustrates in greater detail the processing that signal carried out to being used to transmit according to the inventive method.By analog signal 30 being carried out Fourier transform and its multiplexing (step 31) being can be used in the 4G picocell network for ofdm signal 32 " is adapted to this analog signal 30 ".Being as the criterion is ready for use on this ofdm signal 32 that is transferred to base transceiver station from for example base station controller, frequency spectrum is filtered, so that a plurality of OFDM subcarrier allocation are given the subband 300 of ofdm signal 32.This filtration has demultiplexing and ofdm signal 32 is divided into the function of subband spectrum 300.
Direct and the related subband spectrum 302,304 that these are paired is input to and is used for transmission (step 303) in a pair of copper cable.This alteration of form with them is paired direct and related subband spectrum 302 ', 304 '.Transmitting and receiving (step 305) afterwards, reversing subband spectrum 302 ' another mistake and transfer direct subband spectrum 302 to " (step 306).Then, with re-reversal subband spectrum 302 " related with its direct subband spectrum 304 ', and the two is reconfigured, synchronously and be added to (step 307) together promptly.Result 300 ' is carried out equilibrium (step 309), and especially compensation is for example owing to selectivity low pass or dispersion attenuation or because group delay and the amplitude change that causes the different frequency displacements of different destructivenesses and constructive interference to cause undertaken by cable between transmission period.
With all paired directly and reverse subband spectrum 302 ', 304 ' reconfigure into single subband spectrum 300 ' afterwards, these frequency spectrums are used for the original OFDM frequency spectrum that reconstruct has subband 34 '.Then, this original OFDM frequency spectrum is changed with multiplexing.In addition, sometimes it is calibrated compensating for example influence of variation of temperature, and carry out meticulous equilibrium, promptly carry out equilibrium (step 37) by subband ground.The result is original OFDM frequency spectrum 32 '.At last, send ofdm signal 32 ', for example obtain the inverse Fourier transform of primary signal 30 ' further to handle.If signal has been transferred to wireless headend, then the air interface by wireless network further sends this signal.
Fig. 5 shows the explanatory view of the embodiment of the wireless controller 5 that cable distribution 7 and one or more wireless headends by comprising cable rely on mutually.Cable correlator 52 according to signal waiting for transmission, transmission range and/or for example the type and so on of house wiring or outside run or cable shielding transmission conditions and before each cable in the cable distribution 7 divided into groups, frequency band determiner 51 was determined the useful band of each cable in the cable distributions 7.
If necessary, signal or subband are further handled by processing unit 55, such as multiplexing and/or demultiplexing, mould-number and/or number-Mo conversion, perhaps such as duplicate, reverse, amplify, the signal shapings such as conversion of equilibrium, calibration, Fourier's type.The MAC layer, to the transmission control and the upper-layer functionality of management and all standards in instrument 56, realize.
Fig. 6 shows the schematic diagram of the wireless headend 6 that cable distribution 7 and wireless controller by comprising cable rely on mutually.With the same in the wireless controller of Fig. 5, wireless headend 6 comprises subband filter 63 and signal reconstruction device 64, and processing unit 65, be used for multiplexing and/or demultiplexing, mould-number and/or number-Mo conversion, perhaps such as amplify, calibration, balanced, filter, duplicate, the signal shapings such as conversion of reverse, Fourier's type.
Via antennal interface 67 from antenna receiving signal to be transferred to wireless controller, perhaps from the wireless controller received signal to send by antenna via antennal interface 67.
The example of the wireless headend 6 that is proposed is at the wireless network that mainly has downlink traffic, wherein only carries out necessary frequency band by wireless controller sometimes and determines related with cable.In other wireless network, might be necessary in wireless headend, to realize these functions.
Though described several preferred embodiments of the present invention, those of ordinary skill in the art can recognize, under the situation that does not depart from spirit of the present invention and notion, can carry out various modifications, change and replacement.Therefore, the present invention requires arbitrary form of the present invention or the modification protection with the correct scope with claims.For example, under the situation that does not depart from the scope of the invention, the feature of following dependent claims and the feature of independent claims can be carried out various combinations.In addition, any reference number in the claims should not be construed as the restriction to scope.
Claims (8)
1. a method that is used at wireless network transmission orthogonal frequency-division multiplex singal is wherein passed through the described orthogonal frequency-division multiplex singal of cable transmission between wireless headend and wireless controller, and described method comprises step:
-determine the useful band of every cable;
At least two cables of-association;
-described orthogonal frequency-division multiplex singal is filtered into subband;
The direct frequency spectrum and related cepstra of each subband of-establishment;
-by each subband of one or more cable transmission in the described related cable, wherein by the described direct frequency spectrum of the some cable transmission in the described related cable and by its related cepstra of other cable transmission in the described related cable; And
-reconfigure the related cepstra of each direct frequency spectrum and the described orthogonal frequency-division multiplex singal of reconstruct from subband at receiving terminal with it.
2. method according to claim 1 also comprises step:
After transmission, carry out balanced and/or calibration numeral or numeral and simulation.
3. method according to claim 1 also comprises step:
Before described orthogonal frequency-division multiplex singal is filtered into subband, described orthogonal frequency-division multiplex singal is carried out demultiplexing.
4. method according to claim 1 is wherein transmitted described direct frequency spectrum and described related cepstra by copper cable.
5. wireless controller is used for going to by cable transmission and from the signal of wireless headend, described wireless controller comprises at wireless network:
-be used for determining the device of the useful band of every cable;
-be used for the device of related at least two cables;
-to be used for filtering signals be the device of subband;
-be used for that signal replication, signal reverse and the signal shaping of signal Fourier type conversion; And
-be used for from the device of subband reconstruction signal.
6. wireless controller according to claim 5 also comprises demultiplexing/multiplexer and/or mould-number/number-digital-to-analog conversion apparatus.
7. wireless headend is used for going to by cable transmission and from the signal of wireless controller, described wireless headend comprises at wireless network:
-to the interface arrangement of antenna;
-to be used for filtering signals be the device of subband;
-be used for that signal replication, signal reverse and the signal shaping of signal Fourier type conversion;
-be used for from the device of subband reconstruction signal.
8. wireless headend according to claim 7 also comprises demultiplexing/multiplexer and/or mould-number/number-digital-to-analog conversion apparatus.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05291456.1 | 2005-07-05 | ||
| EP05291456A EP1742434B1 (en) | 2005-07-05 | 2005-07-05 | Method for transporting a signal in a radio network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1893413A CN1893413A (en) | 2007-01-10 |
| CN100546296C true CN100546296C (en) | 2009-09-30 |
Family
ID=35500755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100935300A Expired - Fee Related CN100546296C (en) | 2005-07-05 | 2006-06-26 | Be used for method at the wireless network transmission signals |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7864660B2 (en) |
| EP (1) | EP1742434B1 (en) |
| CN (1) | CN100546296C (en) |
| AT (1) | ATE370590T1 (en) |
| DE (1) | DE602005002050T2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8462737B1 (en) * | 2008-06-27 | 2013-06-11 | Research In Motion Limited | System and method for a MIMO split-physical layer scheme for a wireless network |
| EP2512202B1 (en) * | 2011-04-12 | 2013-11-20 | Alcatel Lucent | Load balancing in a radio access network |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3145003B2 (en) * | 1995-03-23 | 2001-03-12 | 株式会社東芝 | Orthogonal frequency division multiplexing transmission system and transmitter and receiver thereof |
| US5953668A (en) * | 1996-12-17 | 1999-09-14 | Airnet Communications Corporation | Radio channel management functionality distribution in wireless communication system |
| US6693952B1 (en) | 1999-03-16 | 2004-02-17 | Lucent Technologies Inc. | Dynamic code allocation for downlink shared channels |
| KR100402906B1 (en) * | 2001-02-08 | 2003-10-22 | (주)아이앤씨테크놀로지 | Frequency-offset synchronization apparatus and method for an ofdm |
| US7069464B2 (en) * | 2001-11-21 | 2006-06-27 | Interdigital Technology Corporation | Hybrid parallel/serial bus interface |
| DE60224891T2 (en) | 2002-06-13 | 2009-06-18 | Nokia Corp. | METHOD AND NETWORKING FOR THE ADAPTIVE RESERVATION OF CHANNELING CODES AND PERFORMANCE |
| EP1536597B1 (en) * | 2002-09-06 | 2015-01-21 | Fujitsu Limited | Radio network control apparatus |
| US7260055B2 (en) * | 2003-05-30 | 2007-08-21 | Agency For Science, Technology, And Research | Method for reducing channel estimation error in an OFDM system |
| US8040986B2 (en) * | 2003-11-26 | 2011-10-18 | Texas Instruments Incorporated | Frequency-domain subchannel transmit antenna selection and power pouring for multi-antenna transmission |
| IL161869A (en) * | 2004-05-06 | 2014-05-28 | Serconet Ltd | System and method for carrying a wireless based signal over wiring |
-
2005
- 2005-07-05 DE DE602005002050T patent/DE602005002050T2/en active Active
- 2005-07-05 EP EP05291456A patent/EP1742434B1/en not_active Not-in-force
- 2005-07-05 AT AT05291456T patent/ATE370590T1/en not_active IP Right Cessation
-
2006
- 2006-06-05 US US11/446,263 patent/US7864660B2/en not_active Expired - Fee Related
- 2006-06-26 CN CNB2006100935300A patent/CN100546296C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE602005002050T2 (en) | 2008-05-15 |
| DE602005002050D1 (en) | 2007-09-27 |
| EP1742434A1 (en) | 2007-01-10 |
| CN1893413A (en) | 2007-01-10 |
| EP1742434B1 (en) | 2007-08-15 |
| ATE370590T1 (en) | 2007-09-15 |
| US20070008877A1 (en) | 2007-01-11 |
| US7864660B2 (en) | 2011-01-04 |
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